Ship&#39;s davit



Sept. 30, 1930. 4

-. G. TAYLOR SHIP S DAVIT Filed July 20, 1929 2 Sheet-Sheet 1 Patented Sept. 30, 1930 UNITED' STATES' PATENT- OFFICE SHIP'S DAVIT Application filed. July 20, 1929, Serial No. 379,'?50, and in Great Britain November 7, 1928.

This invention relates to 'ships davits, and has for its object to provide simple and ready means for launching beats therefro n;

According to this invention, each davit arm is pivoted, by a horizontal and lo'ngitudinal pivot aXis, to a carriage adapted to travel along a track which is at right angles'to the ships side, and means .are provided whereby, during the outward travel, the arm is automatically caused to Swing outboard. If it is desired that the carriage shall move out under the force of gravity, the track is inclineddownward and outwardwhen the carriage may be controlled by the respective V fall; but if the track is substantially horizontal, means must be provided to impel the carriage outboard; t i

In carrying out the invention, the davit arm has a downward and somewhat forward extension below its pivot aXis with the carriage and carries a roller or rollers at its foot' which, during the first part of the outward travel of the carriage, runs upon a track, or tracks at a predeterrnined point in which, or

pocket to receive the respective roller, Whereby the foot of the arm becomes arrested, with ,the result that further outward movement of the carriage causes the upper end of the arm to swing outboard turning about its pivot axs with the carriage, while the roller or rollers move to some eXtent within the pocket or pockets.

A convenient embodirnent of the invention as appled to a gravity davit is described with reference to the drawings herewith, in which Figure 1 is a view in elevation of the davit as seen from the respective end of the boat,

5 tracks D D composed of two channels with each of which, is fol-med an opening or' the latter being shown in its inboard positheir open sides facing each other. The car- 'rage C, at its real' end, has a pair of rollers i are openings or pockets in the lower flanges of the channelsinto which the .rollers H H can enter, and they are guided into such pockets by curved'wallsK. M M are` stops on the under surfaces of the channels to limit the 'forward travel of the rollers E and consequently of the carriage C 'outboard N is the respective fall passing from a winch, not shown, round a' pulley P, thence to a pulley Q. on, the carriage, then upwa'rd over a guide pulley R on thet carriage and over a pulley S at the head of the davit arin to the shackle T of the boat. a is a catch hook i adapted to engage over the pivot pin of the rollers E E to retain the carriage inboard. The hook has a tal I) extending iuward be'- ,yond the pivot axis 'of the hook and to this tai'l the gr'ipe (for securing the boat) is 4 connected so that the carriage cannot be re.-

leased until the gripe has been cast off.

To launch the boat the gripes are cast ofi and the catch hook of each davit released. Each carriage is then retained solely by its sa fall N. On payng out the fall the carriage goes down the tracks' by gravity and the rollers H H at the foot of the davit, running in the channels, keep the arm in the same relationship to the carriageuntil the rollers H H encounter the'curved walls K which hold back the foot and cause the arm to swing outboard about its pivotiaxis B. The movement of the arin is, however, governed by the travel of the carrage and the rollers H H go down, into the openings or pockets J which pernit of their requisite downward movement. The travel of the carriage is arrested by the rollers E cncountering the stops M, and this, of course, also arrests the outward mo movement of the davit arm. Fur-ther paying out of the fall N simply lowers the boat.

To get a boat inboard, the falls are wound in raising the boat until m hackle T comes against the head of the respective davit arin A, after which the carriage is drawn np the track, and the davit arni swings inboard while the rollers H H, by leaving the openings or pockets and travelling up in the Channels, bring the arm to its final position in relation to the carriage and retain it there.

At the extreme inner end of the travel of each carriage the catch piece is re-engaged and the gripe replaced.

It will be seen that the davit head has a pair ot upwardly and ontwardly curved slots (Z (l in which lies a transverse pin c at the top of the shacklc, whereby the weight of the boat, at the respective davit, is relieved 'l'rom the tall when at the inboard position. When the arm H is outboard, the Slots slope downward and allow the pin to disengage.

` llaving tully described my invention what I claim and desire to secure by Letters Patent is l. A ships davit comprising a track exp tending to the ship s side, a carriage adapted to run on said track and being held thereagainst at its rearward end, a davt arm pivoted to said carriage by a horizontal pivot axis, a downward extension of said arm below its pivot axis and means whereby the foot of said downward extension is held in relation'to the track to cause said arm to Swing onthoard as said carriage moves outward. u

2. A ship s davit comprising a track extending to the ship s side, a carriage adap' ed to run on said track and being held thereagainst at its rearward end, a davit arm pivoted to said carriage by &horizontal pivot axis, a downward extension of said arm below its pivot axis, a portion of said track in which said foot is guided during the first r part of the movement ot the carriage and means whereby said foot is arrested in said track during the latter part ot' the ontward movement of said carriage to cause said arm to Swing outboard.

3. A ship s davit comprising a track extending to the ship s side, a carriage' adapted to run on said track and being held thereagainst at its rcarward end, a davit arm pivoted to a said carriage by a horizontal pivot axis, a downward extension of said arm below its pivot axis a roller on the foot ot said downward extension gnided by a portion ol" said track and an opening in the bottom of said track portion to allow said roller to enter to arrest said roller and allow movement thereof in a direction normal to the track, as said arm swings outboard.

4-. A ship s davit comprising a track extending tothe ship s side, a carriage adapted to run on said track and being held thereagainst at its rearward end, a davit arm pivoted to said carriage by a horizontal pivot axis, a downward extension of said arm below its pivot axis, a roller on the foot of said downward extension guided by a portion of said track, an opening in the bottom ot' said track portion to allow said roller to enter to arrest such roller and allow movement thereof in a direction normal to the track and a wall placed across said track portion to arrest said roller and guide it into the opening as the said arm swings outboard. i '5. A ship s davit comprisinga track extending to the ships side, said track composed of two channels with their open sides acing each other, a carriag'c adapted to rnn on said track, rollcrs of said carriagc cngaging on the upper surfaces of the upper flanges ot said channels, rollers of said carriage engaging on the under surfaces o' the lower ianges of said Channels, a davit arm pivoted to said carriage by a horizontal pivot axis, an extension of said arm below its pivot axis, rollers mounted on the foot oi said extension, and adapted to cngage between the fianges of said Channels and a recess in the lower fiange of each channel each to receive one of said rollers to allow of their movement normal to the track as the arm swings outboard.

In witness whereof I have hereunto signed my name this 5th day of July, 1929.

HUMPHREY GEORGE TAYLOR. 

